Use .nullish() instead of .optional().nullable() in zod

When working with zod, you might have found yourself using .optional().nullable() to make a field optional and nullable. Especially when you are working with tRPC or similar API libraries, this is a common case for API input validation.

But there is a better way to do this.

Instead of using .optional().nullable(), you can use .nullish().

const schema = z.object({ 
    name: z.string().optional().nullable(), // ❌ don't do this
    name: z.string().nullish(), // ✅ do this instead
});